Browse Publications Technical Papers 2002-01-1093
2002-03-04

The Effects of Oil-Derived Poisons on Three-Way Catalyst Performance 2002-01-1093

Two major deactivation mechanisms of automotive catalysts during road usage are:
  1. 1.
    thermal aging
  2. 2.
    poison accumulation of oil-derived poisons such as zinc and phosphorus.
A dynamometer-based aging cycle, incorporating a high-temperature low-poison mode to account for thermal aging followed by a low-temperature high-poison mode to account for poison accumulation, has been developed to allow the examination of catalyst formulations after exposure to both a harsh thermal and chemical aging environment. This type of aging cycle results in dynamometer-aged catalysts that are physically much more similar to road-aged catalysts than thermally-based dynamometer cycles. Using this aging-cycle, Pd-only, Pd-Rh and Pt-Rh light-off catalysts were examined. The Pd-Rh catalyst gave the best overall performance, with equivalent HC light-off performance to the Pd-only catalyst and equivalent NOx performance to the Pt-Rh catalyst.

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